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Founding Machine Learning Engineer
Founding Machine Learning EngineerKey Technology • Fremont, California, United States
Founding Machine Learning Engineer

Founding Machine Learning Engineer

Key Technology • Fremont, California, United States
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Our Client is building a next-generation voice-AI platform that powers curated introductions, agentic scheduling, and real-time feedback.

We’re seeking a founding-calibre ML Engineer to own our machine learning systems end-to-end — from data pipelines and model training to evaluation and low-latency inference.

You’ll design, build, and ship ranking and recommendation systems that make every match feel more personal and improve week after week.

What You’ll Do

  • Design and deploy multi-stage retrieval and re-ranking systems for compatibility, search, and personalisation.
  • Build and maintain data pipelines for training, evaluation, and reporting — ensuring reproducibility and quality.
  • Train and fine-tune LLMs / encoders , manage model versioning, rollout, and rollback.
  • Run offline metrics (AUC, NDCG, MAP) and online A / B tests to measure real-world impact.
  • Build inference services that meet tight latency and cost targets, with caching and fallback strategies.
  • Implement guardrails and monitoring for drift, bias, and reliability; define model SLOs and alerts.
  • Collaborate across ML, platform, and product teams to turn voice and text signals into better matches .

Tech Stack

Python

  • PyTorch
  • Hugging Face
  • OpenAI / Anthropic APIs
  • pgvector / FAISS / Pinecone
  • Postgres
  • Airflow / Prefect / dbt

  • AWS (S3, ECS / Kubernetes, Lambda)
  • CI / CD (GitHub Actions)
  • What We’re Looking For

  • 3+ years of experience in applied ML (ranking, search, or recommendations).
  • Deep Python skills and experience with PyTorch or TensorFlow (Hugging Face a plus).
  • Hands-on with embeddings, LLMs, and vector search (pgvector, FAISS, Pinecone, Weaviate).
  • Proven ability to take models from notebook to production — APIs, CI / CD, monitoring, rollback.
  • Experience building data pipelines with Airflow, Prefect, Dagster, or dbt.
  • Comfortable owning latency, cost, and reliability for inference services.
  • Must be authorised to work in the U.S. and onsite 5 days / week in San Francisco.
  • Bonus Points

  • Experience with real-time or voice systems , retrieval / re-ranking stacks, or feature stores.
  • Prior work at consumer AI, dating, or recommendation startups where you shipped ranking systems.
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    Machine Learning Engineer • Fremont, California, United States

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